ORIGINAL: tkg
If your into fiddling and have some machine tools, you can reshape the slot in the throttle barrel to lean out the mid range. Think of an expo curve.
I was playing with it on the bench today to try to figure out just what I had. The richness seems to be in a narrow area.
Except for the narrow rich area, it ran great. Just as good as the FG-20.
I put a Perry oscillating gasoline pump on it tonight with a Cline regulator. I'll have to remount the engine as the pump is below the level of the crankcase.
I think the wedge slot is the problem as you run the idle needle in farther and the tip is in the wrong place in the Vee?